New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy

Autores
Torres, Andrea Fabiana; Arias, María Laura; Kraus, Michaela; Mercanti, Lorena Verónica; Eenmäe, Tõnis
Año de publicación
2023
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The B[e] phenomenon is manifested by a heterogeneous group of stars surrounded by gaseous and dusty circumstellar envelopes with similar physical conditions. Among these stars, the FS CMa-type objects are suspected to be binary systems, which could be experiencing or have undergone a mass-transfer process that could explain the large amount of material surrounding them. We aim to contribute to the knowledge of a recently confirmed binary, MWC645, which could be undergoing an active mass-transfer process. We present near-infrared and optical spectra, identify atomic and molecular spectral features, and derive different quantitative properties of line profiles. Based on publicly available photometric data, we search for periodicity in the light curve and model the spectral energy distribution. We have detected molecular bands of CO in absorption at 1.62 m and 2.3 m for the first time. We derive an upper limit for the effective temperature of the cool binary component. We found a correlation between the enhancement of the Ha emission and the decrease in optical brightness that could be associated with mass-ejection events or an increase in mass loss. We outline the global properties of the envelope, possibly responsible for brightness variations due to a variable extinction, and briefly speculate on different possible scenarios.
Instituto de Astrofísica de La Plata
Materia
Ciencias Astronómicas
stars: emission-line, Be
stars: peculiar
stars: individual: MWC 645
circumstellar matter
binaries: general
techniques: spectroscopic
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/159964

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network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopyTorres, Andrea FabianaArias, María LauraKraus, MichaelaMercanti, Lorena VerónicaEenmäe, TõnisCiencias Astronómicasstars: emission-line, Bestars: peculiarstars: individual: MWC 645circumstellar matterbinaries: generaltechniques: spectroscopicThe B[e] phenomenon is manifested by a heterogeneous group of stars surrounded by gaseous and dusty circumstellar envelopes with similar physical conditions. Among these stars, the FS CMa-type objects are suspected to be binary systems, which could be experiencing or have undergone a mass-transfer process that could explain the large amount of material surrounding them. We aim to contribute to the knowledge of a recently confirmed binary, MWC645, which could be undergoing an active mass-transfer process. We present near-infrared and optical spectra, identify atomic and molecular spectral features, and derive different quantitative properties of line profiles. Based on publicly available photometric data, we search for periodicity in the light curve and model the spectral energy distribution. We have detected molecular bands of CO in absorption at 1.62 m and 2.3 m for the first time. We derive an upper limit for the effective temperature of the cool binary component. We found a correlation between the enhancement of the Ha emission and the decrease in optical brightness that could be associated with mass-ejection events or an increase in mass loss. We outline the global properties of the envelope, possibly responsible for brightness variations due to a variable extinction, and briefly speculate on different possible scenarios.Instituto de Astrofísica de La Plata2023info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/159964enginfo:eu-repo/semantics/altIdentifier/issn/2075-4434info:eu-repo/semantics/altIdentifier/doi/10.3390/galaxies11030072info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:41:51Zoai:sedici.unlp.edu.ar:10915/159964Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:41:51.701SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
title New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
spellingShingle New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
Torres, Andrea Fabiana
Ciencias Astronómicas
stars: emission-line, Be
stars: peculiar
stars: individual: MWC 645
circumstellar matter
binaries: general
techniques: spectroscopic
title_short New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
title_full New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
title_fullStr New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
title_full_unstemmed New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
title_sort New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
dc.creator.none.fl_str_mv Torres, Andrea Fabiana
Arias, María Laura
Kraus, Michaela
Mercanti, Lorena Verónica
Eenmäe, Tõnis
author Torres, Andrea Fabiana
author_facet Torres, Andrea Fabiana
Arias, María Laura
Kraus, Michaela
Mercanti, Lorena Verónica
Eenmäe, Tõnis
author_role author
author2 Arias, María Laura
Kraus, Michaela
Mercanti, Lorena Verónica
Eenmäe, Tõnis
author2_role author
author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
stars: emission-line, Be
stars: peculiar
stars: individual: MWC 645
circumstellar matter
binaries: general
techniques: spectroscopic
topic Ciencias Astronómicas
stars: emission-line, Be
stars: peculiar
stars: individual: MWC 645
circumstellar matter
binaries: general
techniques: spectroscopic
dc.description.none.fl_txt_mv The B[e] phenomenon is manifested by a heterogeneous group of stars surrounded by gaseous and dusty circumstellar envelopes with similar physical conditions. Among these stars, the FS CMa-type objects are suspected to be binary systems, which could be experiencing or have undergone a mass-transfer process that could explain the large amount of material surrounding them. We aim to contribute to the knowledge of a recently confirmed binary, MWC645, which could be undergoing an active mass-transfer process. We present near-infrared and optical spectra, identify atomic and molecular spectral features, and derive different quantitative properties of line profiles. Based on publicly available photometric data, we search for periodicity in the light curve and model the spectral energy distribution. We have detected molecular bands of CO in absorption at 1.62 m and 2.3 m for the first time. We derive an upper limit for the effective temperature of the cool binary component. We found a correlation between the enhancement of the Ha emission and the decrease in optical brightness that could be associated with mass-ejection events or an increase in mass loss. We outline the global properties of the envelope, possibly responsible for brightness variations due to a variable extinction, and briefly speculate on different possible scenarios.
Instituto de Astrofísica de La Plata
description The B[e] phenomenon is manifested by a heterogeneous group of stars surrounded by gaseous and dusty circumstellar envelopes with similar physical conditions. Among these stars, the FS CMa-type objects are suspected to be binary systems, which could be experiencing or have undergone a mass-transfer process that could explain the large amount of material surrounding them. We aim to contribute to the knowledge of a recently confirmed binary, MWC645, which could be undergoing an active mass-transfer process. We present near-infrared and optical spectra, identify atomic and molecular spectral features, and derive different quantitative properties of line profiles. Based on publicly available photometric data, we search for periodicity in the light curve and model the spectral energy distribution. We have detected molecular bands of CO in absorption at 1.62 m and 2.3 m for the first time. We derive an upper limit for the effective temperature of the cool binary component. We found a correlation between the enhancement of the Ha emission and the decrease in optical brightness that could be associated with mass-ejection events or an increase in mass loss. We outline the global properties of the envelope, possibly responsible for brightness variations due to a variable extinction, and briefly speculate on different possible scenarios.
publishDate 2023
dc.date.none.fl_str_mv 2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/159964
url http://sedici.unlp.edu.ar/handle/10915/159964
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/2075-4434
info:eu-repo/semantics/altIdentifier/doi/10.3390/galaxies11030072
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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